Really great job! The music and art is wonderful, and even though my patience is typically low for platformers, I (think) I made it all the way through (there was no winning notice). For a first time opening cinematic and soundtrack -- both were amazing.
The only thing I would add is some animation to the character: an idle/breathing movement, a squish-down movement when you hit the floor, and stretch-up movement when you jump would be perfect.